Your need to add in the name and explanation of what your are doing on.
Explanation would be much appreciated.
An explanation on how to use the method of solving as well as what the group has done would be helpful.
An explanation will make it much more better to understand what's the group doing on
You could add in what your group is working on and add some comments to explain what the tree diagrams do in explaining your points.
Needs further explanation. What does this numbers represents?
You could include explanations for the probability tree. There are other methods, like the table, to represent the data as well. You could show how the table is being used as well.
They could have provided us with the question so that it is easier to understand and explain their workings.